Journal
JOURNAL OF MAGNETIC RESONANCE
Volume 224, Issue -, Pages 38-47Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2012.08.015
Keywords
Adiabatic inversions; Frequency sweeps; Cross polarization; Broadband cross polarization; Solid-state NMR; Wideline NMR; Stationary sample; CPMG; WURST-CPMG; Sn-119; (207)pb; Pt-195
Funding
- Israel Science Foundation [ISF 447/09]
- ERC [246754]
- EuroMagNet's EU [228043]
- Helen and Kimmel Award for Innovative Investigation
- generosity of the Perlman Family Foundation
- Natural Sciences and Engineering Research Council (NSERC, Canada)
- Ontario Ministry of Research and Innovation for an Early Researcher Award
- Centre for Catalysis and Materials Research at the University of Windsor
- Canadian Foundation for Innovation
- Ontario Innovation Trust
- University of Windsor
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Efficient acquisition of ultra-wideline solid-state NMR powder patterns is a continuing challenge. In particular, when the breadth of the powder pattern is much larger than the cross-polarization (CP) excitation bandwidth, transfer efficiencies suffer and experimental times are greatly increased. Presented herein is a CP pulse sequence with an excitation bandwidth that is up to ten times greater than that available from a conventional spin-locked CP pulse sequence. The pulse sequence, broadband adiabatic inversion CP (BRAIN-CP), makes use of the broad, uniformly large frequency profiles of chirped inversion pulses, to provide these same characteristics to the polarization transfer process. A detailed theoretical analysis is given, providing insight into the polarization transfer process involved in BRAIN-CP. Experiments on spin-1/2 nuclei including Sn-119, Hg-199 and Pt-195 nuclei are presented, and the large bandwidth improvements possible with BRAIN-CP are demonstrated. Furthermore, it is shown that BRAIN-CP can be combined with broadband frequency-swept versions of the Carr-Purcell-Meiboom-Gill experiment (for instance with VVURST-CPMG, or WCPMG for brevity): the combined BRAIN-CP/WCPMG experiment then provides multiplicative signal enhancements of both CP and multiple-echo acquisition over a broad frequency region. (C) 2012 Elsevier Inc. All rights reserved.
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